My 72 350 sat in the garage for three weeks while we were out of town and when I returned, the fuel filter glass was full, but only with air. No fuel getting to the carb so that bad boy is not starting. Not even the whiff of unburned gas after cranking it for a couple minutes (15 seconds at a time). Can someone give me a quick tutorial on how to wake up a fuel pump that has been working great but resents neglect? Which circuit is it on the fuse box, for starters? Thanks, guys!